Stock-Based Compensation

9 Months Ended

Feb. 28, 2021

Share-based Payment Arrangement [Abstract]

Stock-Based Compensation

STOCK-BASED COMPENSATION

The following table summarizes stock-based compensation expense included in Selling, general and administrative expenses for the periods indicated: 

	Three months ended				Nine months ended
	February 28,		February 29,		February 28,		February 29,
	2021		2020		2021		2020
Stock option expense	$	0.7	$	0.4	$	3.5	$	1.4
Restricted stock unit expense		0.7		0.3		1.4		1.5
Management stock purchase plan		0.0		0.0		0.0		0.0
Employee stock purchase plan		0.1		0.0		0.2		0.2
Total stock-based compensation expense	$	1.5	$	0.7	$	5.1	$	3.1

On October 1, 2020, the Company made an additional stock option grant to employees as a non-cash incentive.

The following table sets forth Common Stock issued pursuant to stock-based compensation plans for the periods indicated:

	Three months ended		Nine months ended
	February 28,	February 29,	February 28,	February 29,
	2021	2020	2021	2020
Common Stock issued pursuant to stock-based compensation plans (in millions)	0.1	0.0	0.2	0.1